The real test is the effort to raise them properly. I have developed an equation for this:
e=effort
d=difficulty
x=# of children
e=d^x
Notice that the number of children is in the exponent. The only problem with this equation is that if x > the number of hands you have then d is no longer a constant. To calculate the total d you have to differentiate the equation and multiply the result by d. That give us:
e=(xd^(x-1))d^x
So just figure that out and you will know if you can handle the effort required for the number of kids you plan to have.
They just show up.
Acckk, that looks like math.